Design of a Wideband Circularly Polarized Antenna

Abstract

In this paper, a broadband circularly polarized printed antenna is designed. The circularly polarized radiation of the antenna is realized by S-shaped semicircle splicing structure and L-shaped feeder. At the same time, by designing a convex branch near the feeder on the floor and slotting on the floor below the feeder to broaden the circular polarization bandwidth. On this basis, the third-order impedance converter is used to realize broadband impedance matching. The 10-dB impedance bandwidth and 3-dB bandwidth of the antenna are 68.1 % (3.35GHz, 1.80 GHz -3.66GHz) and 71.5 % (3.10GHz, 1.95 GHz -4.12GHz), respectively. The antenna has simple structure and good circular polarization characteristics.